JP3999143B2 - Micro position adjustment device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a minute position adjusting device, and more particularly to a minute position adjusting device optimal for an objective lens driving device used in an optical disk device that reads or records information recorded on a recording surface of an optical disk.
[0002]
[Prior art]
As an example of the minute position adjusting device, there is an objective lens driving device used in an optical disk device.
[0003]
In an optical disc apparatus, information is recorded on an optical disc-like recording medium, or the recorded information is read and reproduced. This optical disk apparatus can record a relatively large amount of information on a disk, and the recording medium is also rigid and easy to handle. Therefore, the optical disk apparatus is used as an external recording apparatus for computers or a video / audio recording apparatus.
[0004]
In such an optical disk apparatus, an apparatus for driving an objective lens for condensing light onto a recording surface on the optical disk in a focusing direction (direction approaching / separating from the optical disk surface) and a tracking direction (radial direction of the disk) is an objective lens. It is a drive device.
[0005]
In general, an objective lens driving device includes a movable part including an objective lens, a support member that supports the movable part, and a magnetic circuit including a yoke and a permanent magnet.
[0006]
A focusing coil and a tracking coil are attached to the movable part. By applying a driving current to the focusing coil, the movable part is driven in the focusing direction by electromagnetic force generated by the action of magnetic flux from the permanent magnet. Is done.
[0007]
Similarly, by applying a drive current to the tracking coil, the movable part is driven in the tracking direction by an electromagnetic force generated by the action of the magnetic flux from the permanent magnet.
[0008]
As an example of the prior art of such an objective lens driving device, there is a technology described in Patent Document 1.
[0009]
In the technique described in Patent Document 1, an objective lens, a first bobbin portion, and a second bobbin portion are disposed in a lens holder, and the first bobbin portion and the second bobbin portion are spaced from each other. Placed.
[0010]
This space is used as an optical path, and light is irradiated onto the optical disc through the objective lens. The first bobbin portion and the second bobbin portion are connected by a connecting portion, and an objective lens is attached to the connecting portion.
[0011]
A focusing coil and a tracking coil are wound around the first bobbin portion and the second bobbin portion, respectively. That is, the two focusing coils face each other with the space therebetween. Further, the two tracking coils are opposed to each other via the focusing coil with the space therebetween.
[0012]
The light emitted from the light source is reflected by the reflecting mirror disposed in the space portion and below the objective lens, and passes through the objective lens.
[0013]
In addition, a wiring board fixed to a frame (not shown) is attached to the lens holder on the side surface side. Therefore, the space is surrounded by a pair of focusing coils and an objective lens, and light is irradiated from a side surface to which the wiring board is not attached.
[0014]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-175992 [0015]
[Problems to be solved by the invention]
In the prior art, there is no description on how to attach or insert the focusing coil and tracking coil to the lens holder.
[0016]
Usually, the focusing coil and the tracking coil are attached to or inserted into the lens holder in a state in which the fixing part such as the wiring board is attached to one side of the lens holder for the convenience of manufacturing the apparatus.
[0017]
Here, in the above prior art, the focusing coil wound around the first bobbin portion and the second bobbin portion requires an intermediate line connecting the space portions therebetween. Similarly, an intermediate line is required for the tracking coil.
[0018]
Therefore, in order to prevent the intermediate line from blocking the space portion serving as the optical path, a pair of coils connected by the intermediate line is attached or inserted into the lens holder from the fixed portion side.
[0019]
However, a minute position adjusting device represented by an objective lens driving device is small and light, and it is difficult to attach or insert the coil to the lens holder automatically. For this reason, it has been necessary to rely on manual work by hand, but the work is complicated and has become an impediment to improving the assembly work efficiency of the apparatus.
[0020]
Therefore, there has been a demand for a minute position adjusting device having a structure that can easily attach or insert the coil to the lens holder.
[0021]
An object of the present invention is to realize a minute position adjusting device that can prevent a positional deviation of a focusing coil intermediate line and can improve assembly workability.
[0022]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is configured as follows.
[0023]
In (1) minute position adjustment device, current is supplied, generates the movement driving force by a magnetic flux from the magnetic flux generating member, and a pair of position adjustment coils connected in the middle line with each other, and the objective lens, the objective lens while being supported, opening for passing light from the light source to the objective lens is formed, and during the opening is supported at a position where the pair of position adjustment coils are opposed to each other, the pair An intermediate line of the position adjustment coil is arranged on the same plane as the opening on which the opening is formed, avoiding the opening, and the movement restricting member that restricts the movement of the intermediate line in the direction of the opening on the same plane The lens holder is formed.
[0024]
(2) Preferably, in the above (1), the movement limiting member is two protrusions facing each other, and the intermediate line is disposed between the two protrusions.
[0025]
(3) Preferably, in the above (1), the protrusion is formed so as to surround the periphery of the opening.
[0026]
(4) In addition, preferably, in (3) above, there is further provided an other direction position adjusting coil that generates a movement driving force in a direction different from that of the position adjusting coil, and the protrusion supports the other direction position adjusting coil. Has an extension.
[0027]
(5) an objective lens that collects light on the recording surface of the optical disc, a lens holder that holds the objective lens, and two focusing coils that are attached to the lens holder so as to face each other with the objective lens interposed therebetween, A plurality of support members connected to the lens holder and the fixed portion, the lens holder operably supporting the fixed portion, and the lens holder allows light from a light source to pass through the objective lens; In the objective lens driving device, the opening for forming the aperture is formed on a surface opposite to the side to which the fixing portion is connected, and the two focusing coils are supported at positions facing each other with the opening therebetween. , middle line and a terminal line connecting the two focusing coils to each other, the lens holder, the side on which the fixed part is connected being disposed on the opposite side, the intermediate line above Disposed around the opening, the surface of the opposite side, the movement limiting member for limiting the movement of the intermediate lines are formed.
[0028]
(6) Preferably, in the above (5), the movement restricting member is a pair of protrusions facing each other to the body tree, and one of these protrusions is formed around the opening.
[0029]
As described above, by arranging the intermediate line and the terminal line of the focusing coil on the same side of the lens holder farther from the fixed part with respect to the objective lens, the work of assembling the focusing coil to the lens holder, The operation of connecting the terminal line and the support member can be performed from the same side of the lens holder, and the assembly workability can be improved.
[0030]
Further, by providing a projection on the side surface of the lens holder where the intermediate line of the focusing coil is provided, the position of the intermediate line of the focusing coil can be determined, and the positional deviation of the intermediate line of the focusing coil and the intermediate line of the focusing coil can be determined. It is possible to prevent the adhesive that is fixed to the lens holder from flowing out.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic exploded perspective view of a minute position adjusting apparatus according to a first embodiment of the present invention, and shows an example when applied to an objective lens driving apparatus of an optical disk apparatus.
[0032]
In FIG. 1, the x-axis direction is the tangential direction of an optical disk (not shown) disposed in the optical disk apparatus, the y-axis direction is the tracking direction, which is the radial direction of the optical disk, and the z-axis direction is the optical axis of the objective lens 1. This is the focusing direction.
[0033]
The objective lens 1 is attached to an objective lens mounting portion formed substantially at the center of the upper surface of the lens holder 2. The lens holder 2 is formed with two focusing coil mounting portions in the y direction with the mounting portion of the objective lens 1 at the center.
[0034]
The pair of focusing coils (a pair of position adjusting coils) 3a and 3b are inserted from the x-direction insertion opening formed in the focusing coil mounting portion, and the lens holder 2 so that the central axis direction is the z direction. Attached to.
[0035]
Here, the focusing coils 3a and 3b are inserted into the x-direction insertion opening from the surface side (one surface) opposite to the surface side (the other surface) to which the fixing portion 7 described later of the lens holder 2 is connected. Is done.
[0036]
A set of four tracking coils (other direction position adjustment coils) 4a, 4b, 4c, and 4d are attached to the lens holder 2 so that the central axis direction of these tracking coils 4a to 4d is the x direction.
[0037]
The coils 4a and 4c are attached to the lens holder 2 so as to face each other in the x direction, and the coils 4b and 4d face each other in the x direction.
[0038]
The coils 4a and 4c are attached to the lens holder 2 so as to face the coils 4b and 4d in the y direction with the lens 1 in between.
[0039]
Conductive and wire-like support members 6 a, 6 b, 6 c and 6 d have one end fixed to the vicinity of the end of the plate-like fixing part 7 and the other end fixed to the lens holder 2. The plate-like fixing part 7 is connected to the other surface side of the lens holder 2 via the support members 6a, 6b, 6c, 6d.
[0040]
The terminal wires 31a and 31b of the focusing coils 3a and 3b and the terminal wires 41a and 41b of the tracking coils 4a to 4d are connected to the other end of the support members 6a to 6d on the connection substrates 21a and 21b attached to the side surface of the lens holder 2. The side is electrically connected by a conductive fusing material such as solder.
[0041]
Here, the objective lens 1, the lens holder 2, the focusing coils 3a and 3b, the tracking coils 4a to 4d, and the connection substrates 21a and 21b are movable parts. That is, this movable part moves relative to the fixed part 7.
[0042]
Of the two side surfaces parallel to the tracking direction of the lens holder 2, the side surface (one surface) far from the fixed portion 7 with respect to the objective lens 1 is formed with an opening through which light passes.
[0043]
Through this opening, light from an optical system (not shown) can be reflected by a rising mirror disposed below the objective lens 1 and guided to the objective lens 1 to reduce the thickness of the optical disc apparatus.
[0044]
The permanent magnets 11a, 11b, 11c, and 11d whose magnetization directions are in the x-axis direction in FIG. 1 are attached and fixed to an outer yoke 12 that is a yoke member made of a magnetic material.
[0045]
Then, by assembling the outer yoke 12 and the lens holder 2, the permanent magnets 11a to 11d are arranged on both sides of the lens holder 2 parallel to the tracking direction (y direction).
[0046]
The permanent magnets 11a and 11b and the permanent magnets 11c and 11d are arranged so as to face each other with the lens holder 2, the focusing coils 3a and 3b, and the tracking coils 4a to 4d interposed therebetween.
[0047]
The inner yokes 10a and 10b extending from the bottom surface of the outer yoke 12 to the lens holder 2 side are arranged so as to be positioned inside the focusing coils 3a and 3b when the outer yoke 12 and the lens holder 2 are assembled.
[0048]
Thereby, the magnetic circuit through which the magnetic flux from the permanent magnets 11a to 11d passes from the inner yokes 10a and 10b to the outer yoke 12 is formed.
[0049]
In the configuration described above, when a driving current is applied to the focusing coils 3a and 3b, the movable portion is driven in the focusing direction by an electromagnetic force (moving driving force) generated by the action of the magnetic flux from the permanent magnets 11a to 11d.
[0050]
Similarly, when a drive current is applied to the tracking coils 4a to 4d, the movable part is driven in the tracking direction.
[0051]
Here, as shown in FIGS. 1 and 2, the terminal lines 31 a and 31 b and the intermediate line 32 of the focusing coils 3 a and 3 b are on the side surface side of the lens holder 2 farther from the fixed portion 7 with respect to the objective lens 1 ( It is configured to be located on one surface side).
[0052]
Further, projections 8 and 9 that are movement restricting members for the intermediate line 32 are formed on the upper side of the opening of the lens holder 2 so that the intermediate line 32 does not block the opening.
[0053]
Therefore, the focusing coils 3a and 3b are inserted from the side surface (one surface side) of the lens holder 2 and attached to the lens holder 2, and the terminal wires 31a and 31b of the focusing coils 3a and 3b are connected to the connection boards 21a and 21b. Since the operation of fixing the intermediate wire 32 of the focusing coils 3a and 3b to the side surface of the lens holder 2 can be performed from one side surface of the lens holder 2, the assembly workability can be improved. it can.
[0054]
Since the focusing coils 3a and 3b can be brought closer to the permanent magnets 11a to 11d by inserting the focusing coils 3a and 3b from the side surface of the lens holder 2, the driving force can be improved.
[0055]
FIG. 3 is a diagram illustrating an example in which the focusing coils 3a and 3b are inserted into the lens holder 2 from the surface side (the other surface) to which the fixing portion 7 is connected, unlike the present invention.
[0056]
In the example shown in FIG. 3, the operation for inserting and attaching the focusing coils 3a and 3b to the lens holder 2 and the operation for fixing the terminals 33a and 33b of the focusing coils 3a and 3b to the connection substrates 21a and 21b are performed. Need to be done from different directions.
[0057]
In the case of FIG. 3, the terminal wires 33a and 33b of the focusing coils 3a and 3b must be wired through the lens holder 2 to the positions of the connection substrates 21a and 21b. There is a risk of being caught by the holder 2.
For this reason, in the example shown in FIG. 3, it is difficult to improve assembly workability.
[0058]
On the other hand, in the embodiment of the present invention shown in FIG. 2, the terminal wires 31a and 31b of the focusing coils 3a and 3b and the connection substrates 21a and 21b can be on the same side of the lens holder 2, and the terminal wires 31a and 31b can be fixed to the connection substrates 21a and 21b without passing through the lens holder 2.
[0059]
Therefore, the first embodiment of the present invention can also improve the assembly workability in this respect.
[0060]
Furthermore, in the first embodiment of the present invention, as shown in FIGS. 1 and 4, the focusing coil 3 a is formed on the side surface (one surface) of the lens holder 2 far from the fixed portion 7 with respect to the objective lens 1. Protrusions 8 and 9 are formed to limit the vertical movement of the intermediate line 32 of 3b.
[0061]
The protrusion 9 is formed so as to surround the periphery of the opening. The protrusion 8 is formed on the objective lens 1 side, and the protrusions 8 and 9 are formed to face each other. However, it goes without saying that the distance between the protrusions 8 and 9 is not less than the diameter of the intermediate line 32.
[0062]
By passing the intermediate line 32 of the focusing coils 3a and 3b between the protrusions 8 and 9, it is possible to avoid the intermediate line 32 of the focusing coils 3a and 3b from blocking the opening that is a light path. Wiring work such as 32 can be easily performed.
[0063]
Further, it is possible to prevent the adhesive that fixes the intermediate line 32 of the focusing coils 3a and 3b from flowing to the opening provided on the side surface of the lens holder 2.
[0064]
FIG. 5 is a diagram showing an example in which no projection is provided on the side surface of the lens holder 2 unlike the present invention. In the case of the example shown in FIG. 5, if the intermediate line 32 of the focusing coils 3 a and 3 b is not sufficiently fixed with an adhesive or the like, the position of the intermediate line 32 is shifted and provided on the side surface of the lens holder 2. There is a risk that it may protrude from the opening and block light.
[0065]
In the case of the example shown in FIG. 5, the adhesive may flow out to the opening, and light may be blocked by the flowed adhesive.
[0066]
On the other hand, as shown in FIG. 4, according to the first embodiment of the present invention, the displacement of the intermediate line 32 of the focusing coils 3a and 3b and the outflow of the adhesive to the opening are prevented. And reliability can be improved.
[0067]
Further, providing the protrusions 9 around the opening provided on the side surface of the lens holder 2 has an effect of improving the strength of the opening.
[0068]
Thereby, the natural frequency of the elastic deformation mode of the lens holder 2 can be increased and a broadband control system can be realized.
[0069]
As described above, according to the first embodiment of the present invention, the intermediate line 32 is moved to the surface side (one surface) opposite to the surface side (the other surface) to which the fixing portion 7 is connected. Since the projections 8 and 9 which are restricting members are formed so as to prevent the positional deviation of the focusing coil intermediate line of the lens holder 2, the focusing coil 3a, 3b is inserted into the surface where the fixing portion 7 is not attached. Can be done from the side.
[0070]
Therefore, it is possible to realize a minute position adjusting device capable of improving the assembly workability.
[0071]
Since the assembly work of the apparatus can be simplified, it is also possible to perform the manual assembly work with an automatic machine.
[0072]
In addition, the protrusion 9 can prevent the adhesive for fixing the intermediate line 32 from flowing into the opening, thereby improving the reliability of the apparatus.
[0073]
FIG. 6 is a side view of the main part of the objective lens driving device of the optical disk apparatus according to the second embodiment of the present invention.
[0074]
In the second embodiment, the projection 9 is not only formed so as to surround the periphery of the opening, but also an extension 9a extending in the longitudinal direction of the bottom surface of the lens holder 2 (y-axis direction in FIG. 1). , 9b are formed.
Since the other configuration of the second embodiment is the same as that of the first embodiment, detailed description thereof is omitted.
[0075]
Due to the extensions 9a and 9b, the protrusion 9 has a shape having L-shaped corners, and these corners can be used for positioning the tracking coils 4a to 4d.
[0076]
Therefore, the second embodiment has the same effect as that of the first embodiment and the effect that the assembling work can be further facilitated.
[0077]
In the example described above, the protrusion 8 is formed. However, the protrusion 8 may be omitted.
[0078]
In addition, the protrusion 9 is configured to be formed around the opening. However, the protrusion 9 is a side surface of the lens holder 2 and is an area where the intermediate line 32 is disposed. As long as the movement can be restricted, it may be formed in a region other than the periphery of the opening.
[0079]
Further, the intermediate line movement restriction member is not limited to the protrusion, and a groove may be formed, and the intermediate line 32 may be inserted into the groove.
[0080]
Moreover, although the example mentioned above is an example at the time of applying this invention to the objective lens drive device of an optical disk apparatus, this invention is applicable not only to this but the apparatus which adjusts another micro position.
[0081]
For example, the present invention can be applied to a device for adjusting the position of a laser displacement meter and other light focusing.
[0082]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the position shift of a focusing coil intermediate line to the light passage opening part direction can be prevented, and the fine position adjustment apparatus which can improve assembly workability | operativity is realizable.
[0083]
Moreover, since the position shift of the focusing coil and the outflow of the adhesive can be prevented, it is possible to realize a fine position adjustment device with good assembling workability and high reliability.
[Brief description of the drawings]
FIG. 1 is a schematic exploded perspective view of a minute position adjusting apparatus according to a first embodiment of the present invention.
FIG. 2 is an explanatory diagram of insertion work of a focusing coil in the embodiment of the present invention.
FIG. 3 is an explanatory diagram of insertion of a focusing coil in a configuration different from that of the present invention.
FIG. 4 is a side view of an essential part in the embodiment of the present invention.
FIG. 5 is a side view of an essential part in an example of a configuration different from the present invention.
FIG. 6 is an explanatory diagram of a main part in a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Objective lens 2 Lens holder 3, 3b Focusing coil 4a-4d Tracking coil 6a-6d Support member 7 Fixed part 8, 9 Protrusion 9a, 9b Extension part 10a, 10b Inner yoke 11a-11d Permanent magnet 12 Outer yoke 21a, 21b Connection Substrate 31a, 31b Focusing coil terminal line 32 Focusing coil intermediate line 41a, 41b Tracking coil terminal line

Claims (6)

A pair of position adjustment coils connected to each other by an intermediate line, to which a current is supplied and a movement driving force is generated by the magnetic flux from the magnetic flux generating member;
An objective lens;
The objective lens is supported and an opening for allowing light from the light source to pass through the objective lens is formed, and the pair of position adjustment coils are supported at positions facing each other with the opening therebetween. is, the middle line of the pair of alignment coils are arranged to avoid the opening flush with the opening is formed plane, limits the movement of the opening direction of the intermediate line to the same surface A lens holder on which a movement limiting member is formed;
A fine position adjusting device comprising:   2. The minute position adjusting apparatus according to claim 1, wherein the movement restricting member is two protrusions facing each other, and the intermediate line is disposed between the two protrusions.   2. The fine position adjusting device according to claim 1, wherein the protrusion is formed so as to surround the periphery of the opening.   4. The minute position adjusting device according to claim 3, further comprising an other direction position adjusting coil that generates a movement driving force in a direction different from that of the position adjusting coil, wherein the protrusion supports the other direction position adjusting coil. A fine position adjusting device characterized by comprising: An objective lens for condensing light on the recording surface of the optical disc, a lens holder for holding the objective lens, two focusing coils attached to the lens holder so as to face each other with the objective lens in between, a lens holder, A plurality of support members connected to the fixed portion and operatively supported by the lens holder with respect to the fixed portion, and the lens holder is configured to allow light from a light generation source to pass through the objective lens. In the objective lens driving device in which the opening is formed on the surface opposite to the side to which the fixed portion is connected, and the two focusing coils are supported at positions facing each other with the opening in between.
The intermediate line and the terminal line that connect the two focusing coils to each other are arranged on the surface of the lens holder opposite to the side to which the fixing part is connected , and the intermediate line is arranged to avoid the opening. on the surface of the opposite side, the objective lens driving device, characterized in that the movement limiting member for limiting the movement of the intermediate lines are formed.   6. The objective lens driving device according to claim 5, wherein the movement restricting member is a pair of protrusions facing each other, and one of the protrusions is formed around the opening. Objective lens drive.

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